| 摘要: |
| 目的 对2, 4-己二炔-1, 6-二乙基脲(KE)发生固相聚合反应时的显色动力学规律进行研究，为其作为商业化时间温度指示剂的应用提供指导。方法 通过单因素法，分别从浓度、时间、温度3个方面对2, 4-己二炔-1, 6-二乙基脲在聚合反应过程中的显色动力学规律进行研究，利用分光密度仪对光密度值进行测定，并通过计算求得聚合反应的反应级数及反应活化能。结果 随着浓度增大或温度升高，KE聚合反应速率逐渐增大，随加热时间的增长，反应速率先增加后减小，在上述条件下，时间温度指示剂的颜色均不断变深；通过计算得到该聚合反应的反应级数为0.31，活化能为37.09 kJ/mol。结论 KE作为一种新型的时间温度指示剂，其视觉响应信号易于识别；通过改变指示剂的浓度，可实现对不同产品剩余货架信息的监测；根据其活化能值，可判断出该时间温度指示剂可指示的产品活化能范围为12～61 kJ/mol。 |
| 关键词: 2,4-己二炔-1,6-二乙基脲 时间温度指示剂 动力学 活化能 |
| DOI： |
| 分类号:TS206 |
| 基金项目: |
|
| Chromogenic Reaction Kinetics of 2,4-Hexadiyn-1,6-Bis(ethylurea) |
|
WAN Hong-yan, ZHU Guang-ming, SHEN Xue-lin
|
|
Northwestern Polytechnical University, Xi'an 710129, China
|
| Abstract: |
| The work aims to research the chromogenic reaction kinetic law of 2,4-hexadiyn-1,6-bis(ethylurea) (KE) subject to solid state polymerization reaction, so as to provide guidance for its usage as the commercialized time temperature indicator. The chromogenic reaction kinetic law of 2,4-hexadiyn-1,6-bis(ethylurea) in the process of polymerization reaction was studied in the single factor method from such three aspects as concentration, time and temperature. The optical density was measured with spectroeye. Moreover, the order of reaction and reaction activation energy of polymerization reaction were obtained through calculation. The results demonstrated that the rate of KE polymerization increased as the concentration or temperature rose, and elevated initially then slightly decreased with heating time prolonged; during the above-mentioned conditions, the time temperature indicator’s color constantly became darker. The order of reaction and the activation energy calculated of polymerization reaction were respectively 0.31 and 37.09 kJ/mol. As a new type of time temperature indicator, the visual response signal of KE is easy to be identified; through color change of the indicator, the remaining shelf life of different products can be detected. According to its activation energy value, the range of the product’s activation energy to be indicated by the time temperature indicator is 12 to 61 kJ/mol. |
| Key words: 2,4-hexadiyn-1,6-bis(ethylurea) time temperature indicator kinetics activation energy |
